Ribostamycin

Ribostamycin is an aminoglycoside-aminocyclitol antibiotic isolated from a streptomycete, Streptomyces ribosidificus, originally identified in a soil sample from Tsu City of Mie Prefecture in Japan.[1] It is made up of 3 ring subunits: 2-deoxystreptamine (DOS), neosamine C, and ribose.[2] Ribostamycin, along with other aminoglycosides with the DOS subunit, is an important broad-spectrum antibiotic with important use against human immunodeficiency virus and is considered a critically important antimicrobial by the World Health Organization.,[3][4] Resistance against aminoglycoside antibiotics, such as ribostamycin, is a growing concern. The resistant bacteria contain enzymes that modify the structure through phosphorylation, adenylation, and acetylation and prevent the antibiotic from being able to interact with the bacterial ribosomal RNAs.[5]

Ribostamycin
Clinical data
Other names(2R,3S,4R,5R,6R)-5-amino-2-(aminomethyl)-6-{[(1R,2R,3S,4R,6S)-4,6-diamino-2-{[(2S,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]oxy}-3-hydroxycyclohexyl]oxy}oxane-3,4-diol
AHFS/Drugs.comInternational Drug Names
ATC code
Identifiers
PubChem CID
ChemSpider
UNII
ChEMBL
ECHA InfoCard100.053.421
Chemical and physical data
FormulaC17H34N4O10
Molar mass454.47266 g/mol g·mol−1
3D model (JSmol)
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Biosynthesis

The biosynthesis of ribostamycin begins with the sugar, D-glucose, which is phosphorylated at the 6 position to form glucose-6-phosphate. The enzyme rbmA contains a genetic sequence that corresponds to NAD+ binding and catalyzes the formation of 2-deoxy-scyllo-inosose. The enzyme rmbB then catalyzes the transamination of 2-deoxy-scyllo-inosose to 2-deoxy-scyllo-inosamine with L-glutamine and pyridoxal phosphate (PLP). Enzyme rbmC oxidizes the ring to 2-deoxy-3-amino-scyllo-inosose, which is then transaminated by enzyme rmbB to DOS. DOS is then glycosylated by the glycosyltransferase rmbD with uridine diphosphate N-acetylglucosamine (UDP-Glc-NAc) to form 2’-N-acetylparomamine. The deacetylase, racJ, removes the acetyl group and forms paromamine. Paromamine is oxidized by enzyme rbmG and then enzyme rmbH transaminates to produce neamine. Neamine is then ribosylated to form ribostamycin.,[2][3]

References
  1. Shomura, T.; Ezaki, N.; Tsuruoka, T.; Niwa, T.; Akita, E.; Niida, T.; Studies on Antibiotic SF-733, a New Antibiotic. I Taxonomy, Isolation and Characterization. The Journal of Antibiotics. 1970, 23 (3), 155-161.
  2. Subba, B.; Kharel, M.K.; Lee, H.C.; Liou, K.; Kim, B.G; Sohng, J.K.; The Ribostamycin Biosynthetic Gene Cluster in Streptomyces ribosidificus: Comparison With Butirosin Biosynthesis. Molecules and Cells. 2005, 20 (1), 90-96.
  3. Kurumbang N.P.; Liou, K.; Sohng, J.K.; Biosynthesis of Ribostamycin Derivatives by Reconstitution and Heterologous Expression of Required Gene Sets. Applied Biochemistry and Biotechnology. 2011, 163, 373-382.
  4. World Health Organization. Critically Important Antimicrobials for Human Medicine 3rd revision. 2011
  5. Kudo, F.; Eguchi, T.; Biosynthetic Genes for Aminoglycoside Antibiotics. The Journal of Antibiotics. 2009, 62, 471-481.


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